* commit '04a25dda':
  ZP-1103 redirect error output of 'hash git' to /dev/null.
  ZP-916 Undo removal of SYSTEM check.
  ZP-916 Only define constants if they are not defined yet.
  ZP-916 Log message when account is hidden.
  ZP-1098 Use native body type algorithm to set native body type if it is undefined for appointments.
  ZP-972 Fixed @access.
  ZP-1102 Add folder origin constants to the allowed characters in the incoming data filter.
  ZP-916 Remove space in PR_EC_AB_HIDDEN constant name, check if value isset().
  ZP-1101 Log query string.
  ZP-972 Implement ZLog::SpecialLogUser() to be called before authentication is completed to force the generation of a user log, fixed method descriptions, use Log::unauthMessageCache for all unauthenticated users, fixed ZLog dependency in PrintWBXML, removed ZLog::RequestHeaders(), removed ZLog::SetSpecialLogUsers(), removed ZLog::EnableDeviceLog().
  ZP-1098 Set native body type to plain if it is undefined for appointments.
  replace deprecated mapi_openpropertytostream
  ZP-1094 Remove the use of spl_autoload for backend inclusion. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-916 Query and check for PR_EC_AB_HIDDEN.
  ZP-972 Add request header also to device specific log, by moving it from index.php to protected method ZLog::RequestHeader and calling it from ZLog::Initialise and ZLog::EnableDeviceLog.
  ZP-972 Use deviceid and authuser from Logger in zlog instead of getting them from Request. Renamed setLogToUserFile to SetLogToUserFile and added it as public to the abstract Log class. Renamed WbxmlDebug to IsWbxmlDebugEnabled. Fixed typos in function descriptions. Replaced tabs with spaces.
  ZP-972 fix WBXML is not logged for LOGUSERLEVEL >= LOGLEVEL_WBXML, if LOGLEVEL < LOGLEVEL_WBXML and $specialLogUsers is not already defined in config.php, because enabled on runtime via ZLog::EnableDeviceLog() or ZLog::setSpecialLogUsers().
  ZP-972 allow backends to enable device or user specific logging.